Circuit and method for driving a liquid crystal display device using low power
First Claim
1. A driver circuit for driving a liquid crystal display device, the driver circuit comprising:
- a previous data latch that receives at least a portion of display data and outputs the received display data as previous data;
a bias control voltage generator that compares current data of the display data with the previous data and generates a control signal; and
a driver amplifier that receives an input voltage, generates an output voltage, and controls a slew rate in response the control signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided are a circuit and method for driving a liquid crystal display device using low power. The circuit includes a display data latch, a gamma decoder, and a driver cell circuit. The display data latch latches display data from a memory. The gamma decoder receives a plurality of gray scale voltages, and selects and outputs one of the plurality of gray scale voltages in response to the display data. The driver cell circuit receives an output voltage of the gamma decoder and generates an output voltage applied to the liquid crystal display device. The driver cell circuit controls a slew rate in response to comparison result of current data and previous data of the display data. The driver cell circuit includes a previous data latch, a bias control voltage generator, and a driver amplifier. The previous data latch receives a portion or the whole of the display data and outputs the portion or the whole of the display data as the previous data. The bias control voltage generator compares the current data and the previous data of the display data and generates a control signal. The driver amplifier receives the output voltage of the gamma decoder, generates the output voltage applied to the liquid crystal display device, and controls the slew rate in response to the control signal.
53 Citations
17 Claims
-
1. A driver circuit for driving a liquid crystal display device, the driver circuit comprising:
-
a previous data latch that receives at least a portion of display data and outputs the received display data as previous data;
a bias control voltage generator that compares current data of the display data with the previous data and generates a control signal; and
a driver amplifier that receives an input voltage, generates an output voltage, and controls a slew rate in response the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A circuit for driving a liquid crystal display device using low power, the circuit comprising:
-
a display data latch that latches display data from a memory;
a gamma decoder that receives a plurality of gray scale voltages, and selects and outputs one of the plurality of gray scale voltages in response to the display data; and
a driver cell circuit that receives an output voltage of the gamma decoder and generates an output voltage applied to the liquid crystal display device, wherein the driver cell circuit controls a slew rate in response to a result of comparison of current data and previous data of the display data. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A method of driving a liquid crystal display device in a driver circuit having a driver amplifier for receiving a gray scale voltage and generating an output voltage for driving the liquid crystal display device using low power, the method comprising:
-
i. latching at least a portion or the whole of display data and generating previous data;
ii. comparing the previous data with current data of the display data and generating a control signal; and
iii. controlling a bias current of the driver amplifier in response to the control signal. - View Dependent Claims (15, 16, 17)
-
Specification